87636397 has 2 divisors, whose sum is σ = 87636398. Its totient is φ = 87636396.

The previous prime is 87636391. The next prime is 87636433. The reversal of 87636397 is 79363678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79762761 + 7873636 = 8931^2 + 2806^2 .

It is a cyclic number.

It is not a de Polignac number, because 87636397 - 2³ = 87636389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87636397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87636391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43818198 + 43818199.

It is an arithmetic number, because the mean of its divisors is an integer number (43818199).

Almost surely, 2^87636397 is an apocalyptic number.

It is an amenable number.

87636397 is a deficient number, since it is larger than the sum of its proper divisors (1).

87636397 is an equidigital number, since it uses as much as digits as its factorization.

87636397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 49.

The square root of 87636397 is about 9361.4313542321. The cubic root of 87636397 is about 444.1825619536.

It can be divided in two parts, 876 and 36397, that added together give a palindrome (37273).

The spelling of 87636397 in words is "eighty-seven million, six hundred thirty-six thousand, three hundred ninety-seven".